Boyd’s Bible Dictionary:
Shoot or branch
Figuratively, Christ (Isa. 11:1); root (Psa. 74:2; Jer. 10:16); support (Psa. 23:4); authority (Psa. 2:9); affliction (Job 9:34); tithing-rod (Ezek. 20:37).
Strong’s Dictionary of Hebrew Words:
Meaning:
from an unused root of uncertain signification; a twig